A rainbow flag is seen in front of Fitwell Chiropractic Sports Medecine on Noe Street and 22nd Street on Castro Hill on June 21, 2013 in San Francisco, Calif.

A rainbow flag is seen in front of Fitwell Chiropractic Sports...

A rainbow flag is seen in front of Fitwell Chiropractic Sports... Photo-4838108.65260 - SFGate

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Marcus Conant, a doctor known for his work in the early days of the AIDS epidemic, poses for a portrait in his home on Castro Hill on June 21, 2013 in San Francisco, Calif.

Marcus Conant, a doctor known for his work in the early days of the...

Marcus Conant, a doctor known for his work in the early days of the... Photo-4838109.65260 - SFGate

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A "Little Free Library" is seen on the stairs between Collingwood Street and the intersection of Diamond and 22nd Streets on Castro Hill on June 21, 2013 in San Francisco, Calif. "Little Free Library" is a nationwide program that creates small boxes of free books in neighborhood spaces.

A "Little Free Library" is seen on the stairs between Collingwood...

A "Little Free Library" is seen on the stairs between... Photo-4838110.65260 - SFGate

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Electric wires and a grade change sign are seen at the intersection of Noe and Alvarado Streets on Castro Hill on June 21, 2013 in San Francisco, Calif.

Electric wires and a grade change sign are seen at the intersection...

Electric wires and a grade change sign are seen at the intersection... Photo-4838111.65260 - SFGate

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A rainbow flag is seen on a building at the intersection of Castro and 23rd Streets on Castro Hill on June 21, 2013 in San Francisco, Calif.

A rainbow flag is seen on a building at the intersection of Castro...

A rainbow flag is seen on a building at the intersection of Castro... Photo-4838112.65260 - SFGate